Alternativas ao Do! para Firefox com licença comercial

• Firefox
  Todas as plataformas Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry Blackberry 10 Apple Watch Android Wear iPad Android Tablet Kindle Fire PlayBook Web Self-Hosted Software as a Service (SaaS) Firefox Apple Messages S60 Chrome HP webOS Gmail React Vim Install Chrome Extensions Google Chrome to Phone
• Licença comercial
  Qualquer licença Licença gratuita Licença Open Source Licença comercial